Solder for aluminium.



CHARLES WILLMOTT, 0F SMETHWICK, ENGLAND.

SOLDER FOR ALUMINIUM.

N 0 Drawing.

To all whom if may concern:

Be it known that 1, CHARLES VVILLiroT'r, a subject of His Majesty theKing of Great Britainvand Ireland, residing at 124 Park road, Bearwood,Smethwick; in the county of Stafford, England, have invented new anduseful Improvements in Solder for Aluminium, of which the following is aspecification.

' Thisinvention consists of the herein described improved solder forsoldering without the use of flux aluminium to aluminium or forsoldering. aluminium to other metals. When aluminium is soldered by mysaid solder the soldered joints are practically unaffected by time orby'exposure to the atmosphere, or by immersion in rainwater and are I asstrong as anyother parts of the aluminium article which are of the samesectional area.

My improved solder is a composition of the two metals tin and bismuthpreferably in about the following proportions, namely approximately 86%of tin and 14% of his muth. These are melted together so as to bethoroughly mixed and the solder is cast into strips or otherwise formedin convenient pieces for use. .The said solder composed'in the abovestated proportions of tin and bismuth is for general use, but for thosecases where the solder is required'to be extra hard then the proportionofthe bismuth to the tin must be slightly increased accord-Specification of Letters Patent. Application filed August 30, 1912.Serial No. 717,843.

Patented N0v. 1 1, 1913.

ing to the degree of hardness required, and in cases where the solder isrequired to be very soft then the proportion of the bismuth to the tinmust be diminished.

In using the solder above described no flux is necessary but the surfaceof the aluminium where the solder is required to adhere should bescraped clean simultaneously with the running of the solder thereon.This can be accomplished by an ordinary hard soldering gas blow pipewith a scraper like tool suitably held and heated by the blow pipe andadapted to simultaneously scrape the surface and lead the melted solderalong the same.

My experiments show that the solder above described is not a merecoating to the aluilninium but actually amalgamates therewit 1.

What I claim as my invention and desire to secure by Letters Patent is Asolder for aluminium composed of a mixture of tin and bismuth in theproportion of approximately 86% tin to 14% of bismuth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

CHARLES WILLMOTT.

